Kunkle Valves is a leading manufacturer of quality safety and relief valve products for industrial and commercial applications, including steam, air, liquid (including cryogenics) and non-hazardous gases.

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Model 19/20

Extra heavy, rugged construction,.  Both inlet and outlet connections are cast integral with body to permit easy inspection and servicing without disconnecting piping.  Seats lapped for optimum performance.  Spherical pivot between disc and spring corrects misalignment and compensates for spring side thrust.
Specifications:
Sizes:  ½” to 3” [15 to 80 mm]
Pressure/Temperature Limits:  300 psig [20.7 barg]/406 o   F [208   o C] Applications:
Overpressure relief and protection of pumps, tanks, lines and hydraulic systems.
Pressure regulation.
Continuous bypass relief.

Model 30

Top-guided disc provides optimum performance.
Specifications: 
Sizes:  ¼” [7mm]
Pressure/Temperature Limits:  4000 psig[276 barg]/300o F [15 o C] Applications:
Small to medium size, multi-stage, air compressors, intercoolers, aftercoolers,  
instrument/control air lines and systems.
Air Tanks/receivers and pressurized equipment.

Models 71S, 171 and 171S

Extra heavy, rugged construction.  Seats lapped for optimum performance.  Spherical pivot between disc and spring corrects misalignment and compensates for spring side thrust.
Specifications:
Sizes:  ½” to 2” [15 to 50 mm]
Pressure/Temperature Limits:  400 psig [27.6 barg] 550o F {288o C} Applications:
Overpressure relief and protection of pumps, tanks, lines and hydraulic systems.  Acid, caustic,  ammonia and other corrosive liquids requiring iron, steel or stainless steel materials.
Pressure regulation.
Bypass relief.
All 316 stainless steel Models 171S suitable for sanitary/edible corrosive applications.

Model 91

Extra heavy, rugged construction with bolted bonnet to permit easy inspection and servicing without removal from system.  Quality cast iron body and bonnet with bronze trim (insert and disc.)  Available with optional stainless steel insert and disc.  Spring is steel with aluminum painting for corrosion protection.  High lift, wing guided disc offers high relieving capacity.  Insert and disc lapped for optimum performance.  Pivot between disc and spring corrects misalignment and compensates for side thrust.
Specifications:
Sizes:  1-1/2” to 6” [40 to 150mm]
Pressure/Temperature Limits:  400 psig[27.6barg]/406o F [208o C] Applications:
Overpressure relief and protection of pumps, tanks, lines and hydraulic systems.
Pressure regulation.
Suitable for installations where back pressures to 60 psig [4.14 barg] are present.

Models 218 and 228 

Extra heavy, rugged construction and bolted bonnet to permit easy inspection and servicing without removal from system.  Quality cast iron body and bonnet with bronze trim (insert and disc).  Available with optional stainless steel insert and disc.  Spring is steel with aluminum painting for corrosion protection.  High lift, wing guided disc offers high relieving capacity.  Insert and disc lapped for optimum performance.  Pivot between disc and spring corrects misalignment and compensates for side thrust.
Specifications:
Sizes:  3”, 4” and 6” [80, 100 and 150 mm].
Pressure/Temperature Limits:  Adjustable 60/200 psig [4.14/13.8 barg] 406o F (208o   C).
Applications:
Fire Pump Service, UL and FM approved.
218 standard with handwheel for easy adjustment.

Model 140 

Compact design requires minimum installation space.  Angle lapped seat provides tight shut-off.
Specifications:
Sizes:  3/8” and ½” [10 and 15 mm].
Pressure/Temperature Limits:  300 psig [20.7 barg]/406o F [208 o C] Applications:
A general utility valve of all stainless steel construction, including spring, for liquid and non-code vapor installations.

Model 215V  

High capacity full nozzle design.  Bronze nozzle, disc and guide with cast iron housing.  Flat bronze valve seats are lapped for optimum performance.  Warn ring offers easy adjustability for precise opening and minimum pre-open or simmer and exact blowdown control.  Pivot between disc and spring corrects misalignment and compensates for spring side thrust.
Specifications:
Sizes:  2”, 2-1/4” and 3” [50, 65 and 80 mm].
Vacuum Limits:  22” Hg [0.759 Kg cm2]/406o F [208o C].
Applications:
Bulk hauling trailers/equipment.
Light gauge tanks.
Protection of high volume vacuum pumps and conveying systems.

Model 337 

High Capacity full nozzle design.  Bronze nozzle, disc and guide with cast iron housing.  Flat bronze valve seats are lapped for optimum performance.  Warn ring offers easy adjustability for precise opening and minimum pre-open or simmer and exact blow-down control.  Pivot between disc and spring corrects misalignment and compensates for spring side thrust.  Reversible tilt lever for “pull-up” or “pull-down” manual testing.  Optional SS trim available. Specifications:
Sizes:  2”, 2-1/2” and 3” [50, 65 and 80 mm].
Pressure/Temperature Limits:  60 psig[4.14 barg]/406o F [208o C]. Applications:
Protection of low-to-medium pressure, high volume blowers, compressors and
pneumatic conveying systems.
Bulk hauling trailers/equipment.
Light gauge trucks.

Models 264, 265, 266 and 267 

Extra heavy rugged construction.  Top guided design offers high capacity with 0.110 in2 [0.2794 cm2] orifice area.  Seats lapped to optical flatness.  Ball bearing pivot between disc and spring corrects misalignment and compensates for spring side thrust.
Specifications:
Sizes:  ½”, ¼” and 1” [15, 18, and 25 mm].
Pressure/Temperature Limits:  3300 psig[227.6 barg]/750  F [400o C].
Applications:
Protection of pumps, compressors, pressure vessels or systems handling corrosive liquids
or vapors at high pressure and/or temperature.
Sentinel (warning) on steam equipment.

Model 299 

Illustration shows a discharge elbow and drip pan unit attached to a safety valve with  female NPT outlet.  For safety valves with flanged outlet – 2” to 4” – use companion flange, short nipple and drip pan elbow, all same size as valve outlet.  6” and 8” elbows have integral 125# ANSI B16.1 Flange.
Applications: Recommended installation on outlet/discharge pipe for safety valves.  Used on steam service.          

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Model 300/600

High Capacity Carbon Steel Valve
ASME Code Section I and VIII
For High Pressure Boiler Use
Sizes 1¼" thru 6"

Model 338

High Capacity Aluminum Valve
For Low to Medium Pressure High Volume Blowers
Size 2"

Model 537 

Extra heavy construction provides long life.  Top guided disc assembly incorporates resilient seal in seating area.  Working parts are protected from corrosion by discharged liquid by an isolating diaphragm.  Pivot between disc assembly and stem corrects for misalignment and compensates for spring side thrust.  Heavy duty lift lever.
Specifications:
Sizes:  ¾” to 2” [18 to 50 mm]
Pressure/Temperature Limits:  160 psig [11 barg]/250o F [121o C]. Applications:
Hot water boiler and generators.
ASME Code Section IV

Models 541, 542 and 548

Top guided disc – High capacity – Brass construction-
Manual lift ring – Canadian registered. 541 – Brass construction/BUNA-N seat  
542 – Brass construction/Viton Seat
548 – Brass construction/SS seat (metal seats)
Specifications:
Sizes:  ¼” and ½” [7 and 15 mm].
Pressure/Temperature Limits:  400 psig [27.6 barg]/400o F [204o C]. Applications:
Small to medium size, single and multi-stage, air compressors, intercoolers, aftercoolers,
instrument/control air lines and systems.
Air tanks/receivers and pressurized equipment.

Models 910, 911, 912 and 913 

Valve housing is heavy duty cast steel, stainless steel or bronze.  Standard spring material is stainless steel suitable for temperatures to 550o F [288o C].  High temperature alloy spring good to 800o F [427o C].  Hex on valve nozzle provides for easy installation.  Single control ring offers easy adjustability of blowdown.  Pivoting disc design offers exceptional seat alignment.  Seats lapped to optical flatness.  Guide-to-nozzle ratio reduces friction.  Models 920, 921 and 927 are certified for ASME Section 1-Special Requirements.  Models 916, 917 and 918 and 919 O-ring soft seated valves are temperature limited by soft seat material.  Available for FM Firepump service.
Specifications:
Sizes: ½” to 2” (15 to 50 mm].
Pressure/Temperature Limits:
            910: 1400 psig[96.5 barg]/800o F [427o  C]steel/stainless steel trim.
            911:  1400 psig[96.5 barg]/800o F [427o C]all stainless steel.
            912:  300 psig [17.2 barg]/406o F [208o C] bronze/brass trim.
            913:  1400 psig[96.5 barg]/425o F[219o C] bronze/SST trim. Applications:
Air/gas compressors.
Liquid Filled Pressure Vessels/Systems-ASME Sec. VIII(UV)
High Temperature/Pressure Hot Water Boilers – ASME Sec. I(V).
Pressure Vessels – containing gas, air or steam.
Process and industrial applications requiring steel/stainless steel construction.
Optional resilient soft seats available for superior leak free performance. 
Vacuum Service.      

Model 930

Extra high capacity for industrial, commercial and residential low pressure, steam heating boilers.  Cast iron with bronze nozzle, disc and guide.  Large seat area/guide area ratio, along with disc pivot design insures top valve performance.  Flat bronze valve seats are lapped for optimum performance.  Reversible tilt lever for “pull-up” or “pull-down” manual testing.
Specifications:
Sizes:  2”, 2-1/2” and 3” [50, 65 and 80 mm].
Pressure/Temperature Limits:  15 psig [1.03 barg]/250o F [122o C]. Applications:
Low pressure steam heating boilers ASME Code Section IV. 15# seat pressure.

Model 6010/6021/6030/6182/6283

Series 6000  Valve housing is heavy duty casting.  Wide hex on valve body provides clearance for easy installation.  Seats lapped to optical flatness.  Dual control rings offer easy adjustability for precise opening with minimum pre-open or simmer and exact blowdown control.  Ball bearing pivot between disc and spring corrects misalignment and compensates for spring side thrust.  Grooved piston type disc reduces sliding area and friction.  Heavy duty lift level assembly.  Models 6010, 6030, 6182 and 6130 provided with optional resilient O-ring seat for superior leak-free performance.  Models 6021, 6121, and 6934 offer Teflon (PFA) disc insert for exceptional leak-free performance (use on steam only).  Models 6030, 6130, 6230, and 6935 supplied with stainless steel disc and nozzle for use on severe applications and/or seat pressure up to 300 psig [20.7 barg].
Specifications:
Sizes:  ½” to 2-1/2” (15 to 65 mm).
Pressure/Temperature Limits:  300 psig[20.7 barg]/425o F [219o C]. Applications:
Steam boilers and generators.
Air/gas compressors – reciprocating or rotary – portable or stationary, intercoolers
and aftercoolers.
Pressure Vessels – containing steam, air or non-hazardous gas.  Including tanks, receivers, sterilizers and autoclaves.
Pressure Reducing Valves – protection of the discharge or low pressure side of system.
Models 6933,6934, and 6935 are certified for ASME Section IV.
O-ring disk available with BUNA-N, EPR and Viton.

Models 6252 and 6254 

Heavy duty construction of high quality cast iron with stainless steel semi-nozzle trim.  Bolted bonnet design for easy maintenance.  Seats lapped to optical flatness.  Dual control rings offer easy adjustability for precision opening with minimum pre-open or simmer and exact blowdown control.  Heavy duty lift lever assembly.
Specifications:
Sizes:  1-1/2” to 6” [40 to 150 mm]
Pressure/Temperature Limits:  250 psig [17.2 barg]/406o F [208o C].
Applications:
Steam boilers and generators.
Pressure reducing stations.
Air/gas compressors – reciprocating or rotary.
Pressure Vessels – including tanks, receivers, intercoolers, oil-gas separators, lines
Blower applications.
Vacuum service.